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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f6706671dea172a7324230e188f3d5f9d009ffe36bd520933629408a5ca4d0d' 
  AND token = '8gREizjlGrBc/nIlAlNOP4aczJ3Q+mBssIIMf+o6DXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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