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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd357b99e2290db2deac39558b521d94d662b645f3490037c02dc6f77e20c6635' 
  AND token = 'cMb+zmOUdaJcNJaqnwxqN2eHihUGQVcfxto1suyoZ/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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