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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8e17abb08f2da1159bbe273144efa5e90eb6d2c3383fdfac1c6eac1cbfc6cc' 
  AND token = 'so2o1v0bfaG/gA9CDSpvO8v0A26NJ5fsPqfkIJ3ePgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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