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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9713712729c93312cdaa684d51246f419f8dc63818a3076f17b6a291a88a1a' 
  AND token = 'YK/NIYiDJnLyc5c2B8myqXLxQLhWPESMDNPFoyJyHGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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