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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5d33323b060be1bf6b02738c820178abb985bea62b1a9d6739b750b710a7f3e' 
  AND token = 'nTtHiMtjOE1kibo7UeQp2DrdlkW8iEvz1iu/mexqxmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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