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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fbcef1b64e1211ca2c9002a5c52b44dcd57fc9041c687c2ba483db0788062ec' 
  AND token = 'SaEPlTOrhhKrgOk0eWc2AJFM+B6/6eBbf/k9UAK3Eyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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