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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c720333e18b02aedea8a40251049616a8bc3ccf0d7420541f5b03be8a7dd7df1' 
  AND token = 'KWUmBrWi6UC8k3ggJ+IzoatlBiQtM3udO+ICRCKZL+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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