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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c78e5c2561db65043fd736616b4e110964787d242b9f86c0ef07feb102935ee' 
  AND token = 'xF34Ynm6qRr5eq2zA/4ImacDAMfkl5TM4wnLd0DY0FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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