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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019d0a21589e0935eac6f6d0e027bc9ed84cfd3ca7ebe3bbc12be89b24b86bb7' 
  AND token = 'XOSjRwILoeH/tVwXdXNuBkSLvddw3o8nhs2fvqeDMS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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