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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00d5a83041a8c8874c3bc476c0742c774e1e95e325e256c856eb209043b8b1b' 
  AND token = '6AeFYgT0dRgycU4gRUGRtf0DeWMhAbtO82vEmyGCZyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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