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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080bb8fa1dede222b56dccb7fb06d0a07cd194dc9e20dcb914058642a1587487' 
  AND token = 'Rr7onLSiZVRb0r3qRXh74xSqrFIOFte5oSy4F3ygtJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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