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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1851992fdc0f925405eb0764a017641b98b1b6957141f5f392827c0913269b2' 
  AND token = '0njFA9D6R0948NOIa195zm9D5XhOcEnRu61wi8qHUXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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