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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f4b77c6d75ed981c36289d2c542faf510be6ae73d8189f66a188a4b9b7398f' 
  AND token = 'D+LX0ke8KJ2gX+fsuCmWRbIAbPU/weDladrIUY+LYns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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