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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca31114f57039b8a2cf05e7f9661e4f205b246d1e56dedb3fb0cef12e62f1c16' 
  AND token = 'aFkN3WOLoV/mydGkBgjfo7B87OV4KTstdO0mHUyvoaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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