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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272e64b1466269a4daf20a710479daa6dc2bd5163097248957b6b35f319a0d50' 
  AND token = 'n3VRXYF6u6ykkubJfsiwDdpH5asT1yIq5DtTh0n08F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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