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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa960ef7c72ce467ba76c8c3da498245a11aebd34ab8aeb6580aa720960a1cbd' 
  AND token = 'S4w2t9ITFnwSj+rax4rQ4EaqFQ4gEZ4YoS38AlSPg7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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