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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766f171bcb82531cba1c5560ccf83c0d52de95d13dfa006b2883d8fe7e573fbc' 
  AND token = '3gs1qjGVq7FLakcNvzLLY//3XfLisRpY/nMPqhb2sF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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