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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '189f6c32e24a6227bdd3e6d8a71ef869280eebe61cc8af82bc0f35ef89e5637b' 
  AND token = '4aI7wcpQ0X/P76/C9RIHNJpyh8zVFovfzuyJZMRmx3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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