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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c668704cb4aad99d9a5e93cfb076a655e24bfe9f30dc9014cebe40f130120ec7' 
  AND token = 'xorIkcWlU++aacWrezMX+/nFtY9cy4SuCAi/W8fJIG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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