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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da92b1e872d7eff2ebf7a1a10f567f644272038ffc3d4f21d42a1edd20e4d2cf' 
  AND token = 'uiD4OMDsszdC88OkavXPp2LZ5WSh5Fu9kkCv3N6ef7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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