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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edccb6f711b9a156a56538041649341c5be138693b865e3086e5d47aa07082a8' 
  AND token = 'fX845j+Tq/A64ARPHCXiOP2EjCpLTbIc/hsBktYeYN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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