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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd092b775fae0acf026fed6331dc10430e73635514c8cca7e4504f7a260e5e5bb' 
  AND token = 'FSvNmzas6D5GEVgiKOU/yyXVOX7RE+bTs5WJhOFL2mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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