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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32722e9f63a9218f7756d76450df6f0d2ac10e13e9e8f71b7782464458d06c68' 
  AND token = '+n7ctpOP/GeGA9s5rB23nwy0Tr97PquIz40Ya5rNOJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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