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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b000e684abc83c15ebdf86ae409f795d232b3ca2424b66db89283c11cc992b3' 
  AND token = 'H/BzA8haTu9ahZ1ixX+k3k8qvKCV/9Tqxxul01OovO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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