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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86a119e21d68561ba4a9810adbc99cfa911d1a5ea5b912bd0ce0c73694a12d5' 
  AND token = 'NIfmWAFQ+CIzzsd7LhcxZ0hPi8WBlkdr4CynKi1kI3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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