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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05cda7cb969bd83e5b162928297943aab7e514e374318f0751fc58cfac509e47' 
  AND token = '646urh323Z3qQxGLUQAnjefmCXRfbO8n2PqKb1nYEKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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