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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2848f25669c2062a48e210ffb8782985d76e6820d84706c0845cd36898c5816' 
  AND token = '7uSP87fjnqmEAaj1aJnBx6lnyMaGhlAngwCcPo4C7fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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