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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c186aa371498f0074cf8568bf681fe9e3c75dd243c4453191bc006bf571c30f' 
  AND token = 'jF3012Uj2G2hs8hACJzHjhUfRwEDiWD1w3Z1vRWlrq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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