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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d51eeaf716a5829cb3505b89711b0d11fc853a2b7a411dc5f4711c9000d617' 
  AND token = 'QFekBNPfZiEw9j0AZ1L03HHeeSrxmoYKXdxuZesNFd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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