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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0463737ec36b8e0d251283d40b0270536ad7e9c05dfad88697e15d7d472e15' 
  AND token = 'z8gfKrjPHMiTBs6Dp2SNPXnaocft95viTpkvf8A6h3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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