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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ffa7f701b5215d8869f39db917398dd7f5de1afbfcb2b4c16b129bc09a5eea' 
  AND token = 'b1JuIcuiNqMar2b9bNhQn5DImhJMqhrYbYLKcXgV/Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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