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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17cd1f588a3b083f7f792257268d2ae2df0b0fd3e990cc3a2633c750cf16d490' 
  AND token = 'h1SeGQdemQTyeDh2Czd6caYJqk0CMXM8cZXgdNRVcqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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