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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6f546c0d7c9efaaad9713d62684e7c5a4f73e5755ba80c9ec2aa96ed89185d' 
  AND token = 'rCFHrN5JIrI4IEn+gF3ecuZqR6HBWYOVhnfWc6wWuyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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