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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4123f0a48fd92a70065b3a062a4fba2120c5fda0bba17fad9b56bd7911626132' 
  AND token = '27+8Q3/abRnlTkhE9X9FSpj03RBIinW54TOcZuc+lqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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