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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab0e1f97ee7b1a3cccb708d23464d209fd25ee2852c6820647fd6e7935b8936' 
  AND token = 'PeovzLVAFciWO2IMYWidgam16uVD2Ix6UTk5umLQ/MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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