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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d32356edc1d212f6b2f721425d34e6ca26007553ea960dd4f722bba5d9b1ef' 
  AND token = 'BgfjUydim0Txx/pb9l8QApMmz6NzgHbXDMtztf+ZstQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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