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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9067bedcd2e0919cc40cfc2d0cdd434adfbb3bae6952b50b3efc8e530594cb3' 
  AND token = 'h9VHwWYd6GWSiiEU5wX0X8PeY7kMsiO0itoyLOc5Gf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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