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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13aca7e75a33c802b60e1823822c8499ee68aa4105a392fe8fb6498c193c4c54' 
  AND token = 'fnTY3TP1xC5l5qptoeF2/ujTPsEQ1fQz+YYkpltps0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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