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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53b5c3fcff1ad036ad00bdd16edba0b2389101fc22033f09a666693aeb9392fd' 
  AND token = 'XiUjx4QmXUMo84kiTHsS5fQc6jqR6jKiznUgPO3mFWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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