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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113e56ebb8a8d3064ba82e8a10b5bbd713555b0cf94e4bf496435001f89a2daf' 
  AND token = 'mGwqJLxED2rXebVPo9kHlY7Rh+MlnYY7gAJ50eR4JkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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