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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d4656057bee0f9c3f7fa82067ca6440bc7cfbdcf7d263c066b35ac6e35369c0' 
  AND token = '03YCaCpu5zO2UmHDbIDPgRg5xthfuqdEG970mFzwOCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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