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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b0d40e4d282f51b6cc2fc6df966cebccf4d2442f38aae20bbe63993bab9f2a' 
  AND token = 'x7wZBAdD8A9mHKPBpas1vMJw8NY9wjKnAcqG9EVGlVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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