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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876c21d2a1230c98314e4650b976ff3ae8395a5393387c595469219defe2a60b' 
  AND token = 'It5F7O0hRcQQOUlZ7X1OarN9J4R4axyIlOHrjq7kKD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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