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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04986cbc51c0d436d641242d610bb612d60aeeb2bd0761607f46ef77743acd29' 
  AND token = '5HRHO8q1gMzEN6aesTkU8/9k7qxED2HgfNmTkXyRF3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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