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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa24dcc06403a9032ea1228c6c0808e1c9e0d69913529336fb888fe944d86a03' 
  AND token = '7nqDAb2sr+Ci1ng59vB87S8/6jnwj++f61ASNSBaEIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}