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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d8b3da98b3c4b3408361f7ba92fda7d63d7b1e041071248876f91fe50d744a' 
  AND token = '9giiaYpAvUL9eetJkPT2YWSPmO0syUu83zo0M9ooxes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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