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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a83bdd778c232cc215ad836b180b4d11e042ad3984d482ff92cf02769a385b' 
  AND token = 'GJzrCrLOf1vm44KV3amwZ0QeqC2zimWSKpZrfCGXM1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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