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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08b0d88ab227f58da6344926279e2a5f839e8cc2412838dca7c2c511f7741d2' 
  AND token = 'qI2wSb2a/1kwFfZgcKBecOaQATknsyqEs1MWMS4o958=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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